diff --git a/eive_tmtc/tmtc/payload/ploc_supervisor.py b/eive_tmtc/tmtc/payload/ploc_supervisor.py
index 63bbcce..2cdcef5 100644
--- a/eive_tmtc/tmtc/payload/ploc_supervisor.py
+++ b/eive_tmtc/tmtc/payload/ploc_supervisor.py
@@ -27,7 +27,7 @@ from eive_tmtc.utility.input_helper import InputHelper
 
 _LOGGER = logging.getLogger(__name__)
 
-latchup_id_dict = {
+LATCHUP_ID_DICT = {
     "0": "0.85V",
     "1": "1.8V",
     "2": "MISC",
@@ -41,7 +41,7 @@ HARDCODED = "0"
 MANUAL_INPUT = "1"
 HARDCODED_FILE = "/home/rmueller/EIVE/mpsoc_boot.bin"
 
-update_file_dict = {
+UPDATE_FILE_DICT = {
     HARDCODED: ["hardcoded", ""],
     MANUAL_INPUT: ["manual input", ""],
     "2": ["/mnt/sd0/ploc/supervisor/update.bin", "/mnt/sd0/ploc/supervisor/update.bin"],
@@ -59,7 +59,7 @@ update_file_dict = {
     ],
 }
 
-event_buffer_path_dict = {
+EVENT_BUFFER_PATH_DICT = {
     MANUAL_INPUT: ["manual input", ""],
     "2": ["/mnt/sd0/ploc/supervisor", "/mnt/sd0/ploc/supervisor"],
 }
@@ -140,22 +140,23 @@ class SetId(enum.IntEnum):
     UPDATE_STATUS_REPORT = 107
 
 
-class OpCodes:
-    OFF = ["0", "off"]
-    ON = ["1", "on"]
-    NORMAL = ["2", "nml"]
-    HK_TO_OBC = ["3", "hk_to_obc"]
-    REQUEST_HK = ["4", "req_hk"]
-    START_MPSOC = ["5", "start_mpsoc"]
-    SHUTDOWN_MPSOC = ["6", "stop_mpsoc"]
-    SEL_NVM = ["7", "sel_nvm"]
-    SET_TIME_REF = ["set_time_ref"]
-    FACTORY_FLASH = ["factory_flash"]
-    REQ_BOOT_STATUS_REPORT = ["13", "boot_report"]
-    START_UPDATE = ["42", "start_update"]
-    PERFORM_UPDATE = ["update"]
-    FACTORY_RESET = ["factory_reset"]
-    MEM_CHECK = ["mem_check"]
+class OpCode:
+    OFF = "off"
+    ON = "on"
+    NORMAL = "nml"
+    HK_TO_OBC = "hk_to_obc"
+    REQUEST_HK_SET = "req_hk_from_dev"
+    REQUEST_HK_SET = "req_hk"
+    START_MPSOC = "start_mpsoc"
+    SHUTDOWN_MPSOC = "stop_mpsoc"
+    SEL_NVM = "sel_nvm"
+    SET_TIME_REF = "set_time_ref"
+    FACTORY_FLASH = "factory_flash"
+    REQ_BOOT_STATUS_REPORT = "boot_report"
+    START_UPDATE = "start_update"
+    PERFORM_UPDATE = "update"
+    FACTORY_RESET = "factory_reset"
+    MEM_CHECK = "mem_check"
     RESET_MPSOC = "reset_mpsoc"
 
 
@@ -180,21 +181,21 @@ class Info(str, enum.Enum):
 @tmtc_definitions_provider
 def add_ploc_supv_cmds(defs: TmtcDefinitionWrapper):
     oce = OpCodeEntry()
-    oce.add(OpCodes.OFF, Info.OFF)
-    oce.add(OpCodes.ON, Info.ON)
-    oce.add(OpCodes.NORMAL, Info.NML)
-    oce.add(OpCodes.HK_TO_OBC, Info.HK_TO_OBC)
-    oce.add(OpCodes.REQUEST_HK, Info.REQUEST_HK)
-    oce.add(OpCodes.START_MPSOC, "PLOC Supervisor: Start MPSoC")
-    oce.add(OpCodes.SHUTDOWN_MPSOC, "PLOC Supervisor: Shutdown MPSoC")
-    oce.add(OpCodes.SEL_NVM, Info.SEL_NVM)
-    oce.add(OpCodes.SET_TIME_REF, Info.SET_TIME_REF)
-    oce.add(OpCodes.FACTORY_RESET, Info.FACTORY_RESET)
-    oce.add(OpCodes.RESET_MPSOC, Info.RESET_MPSOC)
+    oce.add(OpCode.OFF, Info.OFF)
+    oce.add(OpCode.ON, Info.ON)
+    oce.add(OpCode.NORMAL, Info.NML)
+    oce.add(OpCode.HK_TO_OBC, Info.HK_TO_OBC)
+    oce.add(OpCode.REQUEST_HK_SET, Info.REQUEST_HK)
+    oce.add(OpCode.START_MPSOC, "PLOC Supervisor: Start MPSoC")
+    oce.add(OpCode.SHUTDOWN_MPSOC, "PLOC Supervisor: Shutdown MPSoC")
+    oce.add(OpCode.SEL_NVM, Info.SEL_NVM)
+    oce.add(OpCode.SET_TIME_REF, Info.SET_TIME_REF)
+    oce.add(OpCode.FACTORY_RESET, Info.FACTORY_RESET)
+    oce.add(OpCode.RESET_MPSOC, Info.RESET_MPSOC)
     oce.add("8", "PLOC Supervisor: Set max restart tries")
     oce.add("11", "PLOC Supervisor: Set boot timeout")
     oce.add("12", "PLOC Supervisor: Disable Hk")
-    oce.add(OpCodes.REQ_BOOT_STATUS_REPORT, Info.REQ_BOOT_STATUS_REPORT)
+    oce.add(OpCode.REQ_BOOT_STATUS_REPORT, Info.REQ_BOOT_STATUS_REPORT)
     oce.add("17", "PLOC Supervisor: Enable latchup alert")
     oce.add("18", "PLOC Supervisor: Disable latchup alert")
     oce.add("20", "PLOC Supervisor: Set alert limit")
@@ -208,12 +209,12 @@ def add_ploc_supv_cmds(defs: TmtcDefinitionWrapper):
     oce.add("35", "PLOC Supervisor: Set GPIO")
     oce.add("36", "PLOC Supervisor: Read GPIO")
     oce.add("37", "PLOC Supervisor: Restart supervisor")
-    oce.add(OpCodes.PERFORM_UPDATE, Info.PERFORM_UPDATE)
-    oce.add(OpCodes.START_UPDATE, Info.START_UPDATE)
+    oce.add(OpCode.PERFORM_UPDATE, Info.PERFORM_UPDATE)
+    oce.add(OpCode.START_UPDATE, Info.START_UPDATE)
     oce.add("43", "PLOC Supervisor: Terminate supervisor process")
     oce.add("44", "PLOC Supervisor: Start MPSoC quiet")
     oce.add("45", "PLOC Supervisor: Set shutdown timeout")
-    oce.add(OpCodes.FACTORY_FLASH, Info.FACTORY_FLASH)
+    oce.add(OpCode.FACTORY_FLASH, Info.FACTORY_FLASH)
     oce.add("47", "PLOC Supervisor: Enable auto TM")
     oce.add("48", "PLOC Supervisor: Disable auto TM")
     oce.add("51", "PLOC Supervisor: Logging request event buffers")
@@ -224,7 +225,7 @@ def add_ploc_supv_cmds(defs: TmtcDefinitionWrapper):
     oce.add("56", "PLOC Supervisor: Reset PL")
     oce.add("57", "PLOC Supervisor: Enable NVMs")
     oce.add("58", "PLOC Supervisor: Continue update")
-    oce.add(OpCodes.MEM_CHECK, Info.MEM_CHECK)
+    oce.add(OpCode.MEM_CHECK, Info.MEM_CHECK)
     defs.add_service(CustomServiceList.PLOC_SUPV.value, "PLOC Supervisor", oce)
 
 
@@ -233,39 +234,40 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
     q = p.queue_helper
     op_code = p.op_code
     object_id = get_object_ids().get(PLOC_SUPV_ID)
+    assert object_id is not None
     q.add_log_cmd(f"Testing PLOC Supervisor with object id: {object_id.as_hex_string}")
     obyt = object_id.as_bytes
     prefix = "PLOC Supervisor"
-    if op_code in OpCodes.OFF:
+    if op_code == OpCode.OFF:
         q.add_log_cmd(f"{prefix}: {Info.OFF}")
         command = pack_mode_data(object_id.as_bytes, Mode.OFF, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=command))
-    if op_code in OpCodes.ON:
+    if op_code == OpCode.ON:
         q.add_log_cmd(f"{prefix}: {Info.ON}")
         command = pack_mode_data(object_id.as_bytes, Mode.ON, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=command))
-    if op_code in OpCodes.NORMAL:
+    if op_code == OpCode.NORMAL:
         q.add_log_cmd(f"{prefix}: {Info.NML}")
         command = pack_mode_data(object_id.as_bytes, Mode.NORMAL, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=command))
-    if op_code in OpCodes.HK_TO_OBC:
+    if op_code == OpCode.HK_TO_OBC:
         q.add_log_cmd(f"{prefix}: {Info.HK_TO_OBC}")
         command = obyt + struct.pack("!I", SupvActionId.HK_REPORT)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.REQUEST_HK:
+    if op_code == OpCode.REQUEST_HK_SET:
         q.add_log_cmd(f"{prefix}: {Info.REQUEST_HK}")
         sid = make_sid(object_id.as_bytes, SetId.HK_REPORT)
         cmd = generate_one_hk_command(sid)
         q.add_pus_tc(cmd)
-    elif op_code in OpCodes.START_MPSOC:
+    elif op_code == OpCode.START_MPSOC:
         q.add_log_cmd("PLOC Supervisor: Start MPSoC")
         command = obyt + struct.pack("!I", SupvActionId.START_MPSOC)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.SHUTDOWN_MPSOC:
+    if op_code == OpCode.SHUTDOWN_MPSOC:
         q.add_log_cmd("PLOC Supervisor: Shutdown MPSoC")
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.SHUTWOWN_MPSOC)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.SEL_NVM:
+    if op_code == OpCode.SEL_NVM:
         q.add_log_cmd("PLOC Supervisor: Select MPSoC boot image")
         mem = int(input("MEM (NVM0 - 0 or NVM1 - 1): "))
         bp0 = int(input("BP0 (0 or 1): "))
@@ -273,7 +275,7 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
         bp2 = int(input("BP2 (0 or 1): "))
         command = pack_sel_boot_image_cmd(object_id.as_bytes, mem, bp0, bp1, bp2)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.FACTORY_RESET:
+    if op_code == OpCode.FACTORY_RESET:
         q.add_log_cmd(f"{prefix}: {Info.FACTORY_RESET}")
         while True:
             print("Please select the key for a factory reset operation")
@@ -299,11 +301,11 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
             + struct.pack("!B", restart_tries)
         )
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code == OpCodes.RESET_MPSOC:
+    if op_code == OpCode.RESET_MPSOC:
         q.add_log_cmd(Info.RESET_MPSOC)
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.RESET_MPSOC)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.SET_TIME_REF:
+    if op_code == OpCode.SET_TIME_REF:
         q.add_log_cmd("PLOC Supervisor: Set time reference")
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.SET_TIME_REF)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
@@ -320,7 +322,7 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
         q.add_log_cmd("PLOC Supervisor: Disable HK")
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.DISABLE_HK)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.REQ_BOOT_STATUS_REPORT:
+    if op_code in OpCode.REQ_BOOT_STATUS_REPORT:
         q.add_log_cmd(f"{prefix}:  {Info.REQ_BOOT_STATUS_REPORT}")
         command = object_id.as_bytes + struct.pack(
             "!I", SupvActionId.GET_BOOT_STATUS_REPORT
@@ -388,11 +390,11 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
             "!I", SupvActionId.RESTART_SUPERVISOR
         )
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.START_UPDATE:
+    if op_code in OpCode.START_UPDATE:
         q.add_log_cmd("PLOC Supversior: Start new MPSoC SW update")
         command = pack_update_command(object_id.as_bytes, True)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.PERFORM_UPDATE:
+    if op_code in OpCode.PERFORM_UPDATE:
         q.add_log_cmd("PLOC Supervisor: Perform MPSoC SW update")
         command = pack_update_command(object_id.as_bytes, False)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
@@ -410,7 +412,7 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
         q.add_log_cmd("PLOC Supervisor: Set shutdown timeout")
         command = pack_set_shutdown_timeout_command(object_id.as_bytes)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.FACTORY_FLASH:
+    if op_code in OpCode.FACTORY_FLASH:
         q.add_log_cmd(f"{prefix}: {Info.FACTORY_FLASH}")
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.FACTORY_FLASH)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
@@ -467,7 +469,7 @@ def pack_ploc_supv_commands(p: ServiceProviderParams):  # noqa C901
         q.add_log_cmd("PLOC Supervisor: Continue update")
         command = object_id.as_bytes + struct.pack("!I", SupvActionId.CONTINUE_UPDATE)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=command))
-    if op_code in OpCodes.MEM_CHECK:
+    if op_code == OpCode.MEM_CHECK:
         custom_data = bytearray()
         update_file = get_update_file()
         memory_id = int(input("Specify memory ID: "))
@@ -550,9 +552,9 @@ def get_latchup_id() -> int:
     description_string = "Description".ljust(description_column_width)
     print(f"{key_string} | {description_string}")
     print(separator_string)
-    for key in latchup_id_dict:
+    for key in LATCHUP_ID_DICT:
         key_string = key.ljust(key_column_width)
-        description_string = latchup_id_dict[key].ljust(description_column_width)
+        description_string = LATCHUP_ID_DICT[key].ljust(description_column_width)
         print(f"{key_string} | {description_string}")
     return int(input("Specify latchup ID: "))
 
@@ -706,25 +708,25 @@ def pack_logging_set_topic(object_id: bytes) -> bytearray:
 
 def get_update_file() -> str:
     _LOGGER.info("Specify update file ")
-    input_helper = InputHelper(update_file_dict)
+    input_helper = InputHelper(UPDATE_FILE_DICT)
     key = input_helper.get_key()
     if key == HARDCODED:
         file = HARDCODED_FILE
     elif key == MANUAL_INPUT:
         file = input("Ploc Supervisor: Specify absolute name of update file: ")
     else:
-        file = update_file_dict[key][1]
+        file = UPDATE_FILE_DICT[key][1]
     return file
 
 
 def get_event_buffer_path() -> str:
     _LOGGER.info("Specify path where to store event buffer file ")
-    input_helper = InputHelper(event_buffer_path_dict)
+    input_helper = InputHelper(EVENT_BUFFER_PATH_DICT)
     key = input_helper.get_key()
     if key == MANUAL_INPUT:
         file = input("Ploc Supervisor: Specify path: ")
     else:
-        file = event_buffer_path_dict[key][1]
+        file = EVENT_BUFFER_PATH_DICT[key][1]
     return file